22221440 has 32 divisors (see below), whose sum is σ = 53124660. Its totient is φ = 8888320.

The previous prime is 22221391. The next prime is 22221449. The reversal of 22221440 is 4412222.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 22202944 + 18496 = 4712^2 + 136^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (22221449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16721 + ... + 18000.

Almost surely, 2^22221440 is an apocalyptic number.

22221440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22221440 is an abundant number, since it is smaller than the sum of its proper divisors (30903220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22221440 is an equidigital number, since it uses as much as digits as its factorization.

22221440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34740 (or 34728 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 22221440 is about 4713.9622399845. The cubic root of 22221440 is about 281.1409229697.

Adding to 22221440 its reverse (4412222), we get a palindrome (26633662).

The spelling of 22221440 in words is "twenty-two million, two hundred twenty-one thousand, four hundred forty".